Ecobee 3 Lite Electrical Box Mount

thingiverse

This plate is for attaching an Ecobee 3 Lite to a vertically oriented electrical box wall opening. Since the separation between the holes in the Ecobee-supplied wall plate and "backplate" are closer than those in a standard electrical box, I needed some kind of adapter plate. This is a problem others have solved, but other designs include four holes, and that don't allow enough room for the electrical box mounting screw heads to clear the rear contours of the wall trim plate that came with my Ecobee. Maybe the design has changed, or maybe folks don't mind the interference, but I made one that has three holes, using the upper electrical box screw hole to secure this plate and the Ecobee trim plate and backplate. Since the middle hole will have threads cut by the screw, I printed it in PETG with 100% fill and .25mm layers. To install (after disconnecting power of course): - Thread the wire through the square opening in this mounting plate. - Screw the plate to the electrical box using the *lower* (clearance) screw hole. Line up the upper plate hole to the electrical box before tightening the lower screw. - Thread the wire through the Ecobee wall trim plate and through the backplate with the terminals. - Attach the wires to the terminals. - Screw the backplate, trim plate, and this mounting plate to the upper electrical box screw hole. Don't tighten it completely since you will need to adjust the mount to level it in the next step. - Using one of the screws that came with the Ecobee, screw the back plate and trim plate to the middle screw hole of this mounting plate, turning the screw firmly to cut threads into the 3D printed plastic. Make sure it is level before fully tightening it. - Fully tighten the upper screw that attaches to the electrical box. - Stuff the slack wire into the wall, plug in your Ecobee, turn the circuit back on, and continue your setup.